Photographic daylight developing apparatus.



H. C. ANDREWS. PHOTOGRAPHIC DAYLIGHT DEVELOPING APPARATUS.

APPLICATION FILED MAY 19, I914.

IOI

771/d re wS Patented Feb. 8, 1916.

Jfaro wa fim-ses THE COLUMBIA PLANOGRAPH c0., WASHINGTON, D. c.

HAROLD CECIL ANDREWS, OF LONDON, ENGLAND.

PHOTOGRAPHIC DAYLIGHT DEVELOPING APPARATUS.

Specification of Letters Patent.

Patented Feb. 8, 1916.

Application filed May 19, 1914. Serial No. 839,583.

To all whom it may concern:

Be it known that I, HAROLD Cnorr. AN- onnws, subject of the King of the British Dominions, residing at London, England, have invented certain new and useful Improvements in Photographic Daylight Developing Apparatus, of which the following is a specification.

My application for patent Serial No. 819786, filed June 10, 1914, describes a new or improved device for exposing photographic dry-plates in a camera in such a manner, that all manipulations can be conveniently carried out in daylight.

The present invention relates to apparatus for developing and fixing photographic dryplates in daylight and it is specially esigned for use in combination with photographic dark slides of the kind described in my application No. 819786.

In further describing the invention reference will be made to the accompanying drawings, which show an example of a developing apparatus embodying my invention.

Figure 1 is a face view of the same, Fig. 2 is a vertical section along line AB of Fig. 1, Fig. 3 is a side view, Fig. i is a horizontal section along line C-D of Fig. 1, Fig. 5 is a vertical section of the vent tap along line E-F of Fig. 1, Fig. 6 is a partial plan of the developing apparatus.

a represents the tank closed by a cap I) which serves as a casing for the rotary shutter or valve 0 andis provided with a funnel or mouth 19. Each end of the said cap is prox'ided with a tooth or hook b for securing it to the tank by means of a looped wire (Z pivoted to the side of the tank, and held in its closing position by an eccentrically pivoted spring d.

The joint between the tank and the cap is kept tight by means of a packing strip 6.

The valve 0 has a diametrical opening as long as the inside of the mouth b One end of the valve is provided with a thumb screw 0 and with a stop-pin c screwed into the valve and projecting through a segmental recess 6 of the valve casing, so that the valve can only be turned about 90. It may be withdrawn from the casing for the purpose of cleaning, after having turned back a screw b which extends into a circular groove of the valve.

To the can b are nally grooved bars fixed a pair of longitudiextending downward into the tank and joined together at the lower ends by a flat spring g, which serves to support the photographic plate and can be turned on a pair of screws 9, to facilitate the removal of the developed plate.

The bottom of the tank has an internal nipple (L1 provided with a fill-opening a into which may be screwed a filling tube fitting the mouth of a bottle which holds the fixing liquid or water.

The fill opening is normally closed by a screw plug 6 to which is hinged a handle 11 The lower end of the tank has a partition a which serves as a light trap, and allows at one end communication with the interior of the tank.

On the partition a is formed a tube (1 adapted to communicate with the interior through a narrow side opening a and provided with a deflecting plate or partition (1, serving as a light trap. The opening a is normally closed by a screw plug is and allows air to escape from the tank when liquid is poured in through the opening (1 Across one of the upper corners of the tank is inserted a vent-tap Z, which is adapted to turn in a cylindrical casing forming part of the tank and has an axial socket Z- open at one end. The said tap has a handle 1 and a longitudinalslot Z adapted to communicate with through a similar slot formed in the base of the said casing. A bafile plate m fixed to the tank extends across the said slot and serves as a light trap.

The process of developing and fixing plates may be carried out as follows :The cap I) together with the guide frame is removed, developing liquid is poured into the tank until it is about full, after which the cap is replaced and fastened, a dark slide, such as described in my application for patent mentioned above, is mounted on the mouth b, or the mouth 71 is applied to the mouth of the slide, as indicated by Fig. 2, while in the camera, the transverse shutter on the dark-slide is drawn out, the vent-tap l is turned into the open position, the transverse shutter c on the tank is turned into the open position, and the plates are allowed to drop directly into the guide-frame b. Subsequently the shutter c is closed and the plates are allowed to develop a suitable time, according to the developer used. The developer is then poured off through the fill opening a, water is poured in to Wash the plates the interior of the tank and subsequently poured off and replaced by fixing liquid. Af er allowing sufficient time for fixing, the cap 7) together with the guide frame is drawn out and the plates are removed from the guide frame 6 after the base g has been turned sidewise on its hinges. The mouth of the dark slide fits into the mouth 6 The latter has in each face a recess 6 and the mouth of the dark slide has a stud adapted to enter either of the said recesses.

Tanks may be adapted to develop two, four, or more plates or pairs of plates by adopting a shutter c and a rectangular guide-frame for each plate or pair of plates.

It has already been proposed to provide a daylight developing tank with a rotary transverse shutter situated near the open end of the tank, or with a rectangular frame or guide for holding the plates in the bath, or with a filland discharge opening closed by ascrew plug, and I do not claim the said feature per 86.

IV hat I claim is 1. In a photographic developing apparatus comprising an approximately rectangular tank for containing the developing liquid, the combination of a tank intended to be filled with developing liquid, with a removable cap fitting on the open top of the tank with a hermetic joint, the said cap having a funnel iittii the projecting mouth of a dark slide, a "ansverse shutter, a plateholding frame dipping into the fastener adapted to secure tank, when the cap is mounted on the same, substantially as described.

2. In a photographic developing apparatus comprising an approximately rectangular t nk for containing the developing liquid, the combination of a tank intended to tank, and a the cap to the be filled with developing liquid, with a removable cap fitting on the open top of the tank with a hermetic joint, the said cap having a funnel fitting the projecting mouth of a dark slide, a transverse shutter, a flat plateholding frame consisting of a pair of longitudinal guide bars and a transverse piece dipping into the tank and a fastener adapted to secure the cap to the tank, when the cap is mounted on the same, substantially as described.

3. In a photographic developing appara tus comprising an approximately rectangular tank for containing the developing liquid, and having at one end an opening con trolled by a transverse shutter, a removable cap mounted on the open end of the tank, the said cap having a funnel for introducing the photographic plates, and an open rectangu lar guideand. supporting frame provided with an elastic supporting bar hinged to the sides of the said frame, substantially as described.

4. In a photographic developing apparatus comprising an approximately rectangular tank for containing the developing liquid and having at one end an opening controlled by a transverse shutter, the develop ing tank having in its base a filland discharge-opening closed by a screw-plug and in the side near the lower end a vent closed by a screw-plug, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HAROLD CECIL ANDRElVS.

Witnesses HENRY J OHN BROOKWELL, WILLIAM E. Rooms.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents- Washington, D. C." 

